Pneumatic apparatus for applying rough-cast or other plaster to the walls of buildings or structures or other surfaces.



f I. L. McKIM & I. IOHNSTON. ffmmrmmm AWMATUS Fon APPLYmG ROUGH. cast 0R OTHER PLAST En 1o THE wMLsor BUILDINGS 0R STRUCTURES 0R DINER SURFACES.

2 SHEETS-SHEET l.

PatentedSept. 4, 1917.

I mrs" APPLICATION FILED MAR. BI. |91?.

J. L. McKIM l. JUHNSTDN.

PNEUMATIC APPARATUS FOR APPLYTNG ROUGH CAST 0R eTHER PLASTER To THE WALLS 0F BUIIQDINGS 0R SIRUCTURES 0R OTHER SURFACES.

APPLICATION FILED MMI. 3l. Hill'.V

Patented Sept. 4, 1917.

2 SHEETS-SHEET 2.

UNITED sTATEs PATENT OFFICE.

JOHN LAYNG MCKIM, 0F LONDON, AND JOHN JOHNSTON, OF WESTMINSTER, LNDON,

ENGLAND; SAID JGHNSTON ASSIGNOR TO SAID MGKIM.

PNEUMATIC APPARATUS FOR APPLYING ROUGH-CAST 0R OTHER PLASTER T0 THE WALLS 0F BUILDINGS 0R STRUCTURES OR OTHER SURFACES.

i Specication of Letters Patent.

Patented sept. 4, 1917.

Application lcd March 31, 1917. Serial N 0. 159,022.

To all whom t may concern.'

Be it known that we, JoHN ,LAYNG Mc- KIM and JoHN JoH-Ns'roN, both subjects of the King of Great Britain, residing, respectively, at 22 Great St. Helens, London, England, and The Globe Pneumatic Engineering Co., Ltd., 1 Victoria street, Westminster, London, England, have invented new and useful Improvements in Pneumatic Appa ratus for Applying Rough-Cast or other Plaster to the Walls of Buildings or Structures or other Surfaces, of which the following is a specification.

This invention relates to apparatus for applying an ag egate of sand, granite or other chips or t e like, mixed with lime or cement in the form of plaster to walls, or to the surface of girders or other structures, and tothat class of such apparatus wherein air pressure is employed for expelling the plaster from a nozzle to which it iscon` veyed.

According to the present invention use is made of a vacuum in conjunction with air pressure, the vacuum being used for conveying the plaster materials to the point at which, or adjacent to that at which, they are acted upon by the air pressure for carrying them into contact with the water and applying `themi'to the surface to be coated.

In carrying out the invention there is provided what may be termed a centrifugal chamber and a collector chamber, the former of which is connected to an apparatus for exhausting theair therefrom and is also provided with a nozzle for the connection of a pipe through which the component parts of the plaster are to be drawn by means of the vacuum,r the said nozzle being advantageously arranged tangentially in order that the components, which are in a dry condition, will enter witha whirling motion. The collector chamber is in open communication with the centrifugal chamber and has connected to it a hollow cone or sleeve through which the components are delivered into a compressed air nozzleV surrounding the said cone,` the said compressed air nozzle having Ybeing inclosed by a hollow casing g combined with it means for ejecting a spra of water through which the materials wi be forced by the air pressure.

The invention will be readily understood by reference to the accompanying drawings, in Whichz- Figure 1 is a sectional side view of our improved apparatus, and

Fig. 2 is a sectional plan.

Fig. 3 1s a section on the line 3 3, Fi 1.. centrifugal chamber, w 'ch a indicates the is preferablyof cylindrical form and has a pipe b arranged axially within it, one end of which is in open communication with the interior of the said chamber, while the other end is designed to bev connected to a pump or exhauster by means of which a partial vacuum can be maintained in the said centrifugal chamber. Externally the centrifugal chamber has applied to 1t a tangential nozzle c to which a conductor pipe can be connected and through which the component parts of the plaster are designed to' be drawn y means of the vacuum produced in the said centrifugal chamber, the tangential arrangement being employed in order that the said components, which are in a dry condition, will enter with a whirling motion and become thoroughly intermingled.

d is the collector chamber which is 'aplied upon the wall of the centrifugal chamer and is connected to the latter by a slot or opening e in such a manner that as the materials are caused to whirl in the centrifugal chamber a they will gradually gravitate through the said opening c into" the said collector chamber.

f is the hollow cone or sleeve through which the material collectin in the chamber d is discharged, the sai cone or sleeve in such a manner that an annular opening h is formed around the mouth of the said cone or dsleeve f, the said opening h being in communication with a pipe i through which compressed air can be supplied.

The casing g is extended in front of the cone or sleeve f, to form a nozzle le through which the materials are discharged under the pressure of the air issuing through the annular opening h, and this nozzle k 1s surrounded by a water nozzle Z formed by two sleeves fm, m1 adjustably fixed upon the nozzle lc and having their outer ends brought into coincidence in such a manner that an annular passage can be formed between them through which water will be sprayed on to the dry material dischar ed through the nozzle lo. Water is supplie to the nozzle Z, by pipes connected to the sockets n, through t e passageso, o and the space p between the two sleeves m, m1. n

With this arrangement hereinbefore described it will be understood that when air, at suicient pressure, is discharged through the annular opening la, a vacuum will be produced in the cone or sleeve f and will draw the material deposited in the collector cham ber d into the nozzle k and discharge it. As, however, the chamber d and the centrifugal chamber a are under a partial vacuum, roduced by the exhauster, as before descri ed, the velocity of the air issuing through the annular opening h must be suilicient to counteract the action of the vacuum which tends to draw the material back out of the cone or sleeve into the collector chamber. As the materia is driven b the air through the nozzle k water is cause to'issue through the annular opening in the water nozzle l in sullicient quantity to wet the dry material to the requisite extent for causiidg it to adhere to the surface to be cover g, q are handles which are connected to f the centrifugal chamber and which serve greater facility for manipulating the apparatus.

In the apparatus shown, the delivery nozzle is applied directly to the collector chamer. If desired, however, the various nozzles and the means for supplyin water or compressed air to the latter may e made independent of the said collector chamber and connected to the latter by a flexible pipe or hose; this arrangement has the advantage that the nozzles can be handled with much than when combined with the centrifuga and collector chambers, and when the nozzles are thus separately formed, the collector and centrifugal chambers may be mounted upon a stand.

In order that the operator may control the discharge, the pipe b, through which the centrifugal chamber is exhausted has arranged in conjunction with it a valve r the opening of which serves to admit air into the centrifugal chamber and so prevent the material from being drawn into the latter under the action of the suction. As shown in Fig. 2, this valve is arranged in conjunction with a lever s connected to a rod t in a position adiaeent to one of the handles g so as to be easily operated by a finger.

'u indicates a filter of wire gauze or the cast or other plaster, a cham like, which is placed around openings in the pipe b, for preventing the sand and other materials from being drawn into the exhauster. e, in the cone f and the nozzle k respectively and which can be renewed from time to time as they become worn by the material which passes through them.

Having now particularly described and ascertained the nature of our said inventionV and in what manner the same is to be performed, we declare that what we claim 1s:-

1. In an apparatus for applying rough cast or otherplaster to walls or the like, a cylindrical mixing chamber, a tangential inlet passage for conveyin material to said chamber, and a passage for exhausting air from said chamber, whereby the material is drawn into the chamber and whirled about the same to mix said material.

2. In an apparatus for applying rough cast or other plaster to walls or the like, a cylindrical mixin chamber, a collector chamber into which the material passes from the mixing chamber after the same has been mixed, a tangential inlet passage for conveying the material to said mixing chamber, and a passage for exhausting air from said mixing chamber, whereby the material is drawn into the mixing chamber and whirled about'the same to mix said material.

3. In an apparatus for applying rough cast or other plaster to walls or the like, a cylindrical mixing chamber provided with an outlet slot, a tube arranged axially within said chamber and'provided at its forward end with apertures through which air may be exhausted from said chamber, a tangential nozzle connected to the wall of the mixing chamber near the rear end of the same for admittin the material to said chamber, and a co ector chamber connected to the mixing chamber for catching the material which falls through said slot.

4.\In apparatus vfor supplying rough cast or other plaster, a cylindrical mixing chamber provided with an outlet slot, a tube arranged axially within said chamber and provi ed at its forward portion with aperturesthrough which air may be exhausted from said chamber, a valve for normally preventing exterior air from entering said pipe, a tangential nozzle connected to the.

wall of the mixing chamber near the rear end of the same, for admitting plastering material to said chamber, and a collector chamber for catching the material `which falls through said slot.

5. In an apparatus for applying rough r into which the plaster materials are drawn under the action of a vacuum produced in said chamber, a second chamber connected thereto in fw are rubber linings arranged Y f ducing a current of which the materials drawn into theother chamber collect,\and a nozzle through which said collected materials are discharged.

6. In an apparatus for applying coating to walls or the like, the combination of a chamber into which the plaster materials are drawn under `the 1action of a vacuum produced in the said chamber, a second chamber connected thereto into which the materials drawn into the other chambercollect, a nozzle through which such collected materials are discharged, means for proair around the said 

